The “war of the currents”, when Westinghouse tried to convince the world that AC was the best choice for generation and transmission of power while Edison championed DC, is well known to engineers. And so is Edison’s gruesome attempt to...

It could be argued with considerable justification that insulation testers regularly save lives by revealing potentially dangerous insulation faults and failures. But this story is a little different. It begins with a Megger MIT515 5 kV insulation tester...

Field personnel face a range of difficult challenges when carrying primary injection tests. These include: input power requirements, test circuit impedance, high current requirements, high impedance test objects, setting target currents, current decay, DC...

There are even those who would suggest that, as so few power transformers fail in service, there is little point in routinely testing them, especially when budgets are tight